Improvement in key-hole guards



Figa.

Figa.

ILPETERS, PHOTO-LATMDGRAPNER. WASHINGTON. D. C.

patent effin.

-GEORGIE c. Boven-or CINCINNATI, AoHIo.-

Letters Patent No. 113v,621. dated April 11, 1811.

IMPROVEMENT IN KEY- HOLE GUARDS.'

The Schedule referred to in these Letters Patent and making part ofthe same.

*Y I, `(leunen O. BovnY, of Cincinnati,` lHamilton county, Ohio, ,haveA invented certain Improvements in Key-Hole Guards, of which the following is a specification.

Nature and Objects of the Invention.

vThis invention relates to a guard which is to be applied to the case of a lock in such a manner as to eiectually prcventthe bolt being thrown by any other than the proper key, the details ofthe device being hereinafter fully described.

Description of the Accompanying Drawing. "Figure 1 is a perspective view of a lock provided with my improved key-hole guard;

Figure 2 is a similar view of the lock with the key nserted,a portion ofthe case being broken away; and

Figure 3 is a partially sectionized view, of the key.

General Description.

I is the key, which has attached to ,the end of thel barrel a short stud or extension, i.

. Upemton.

Whenever the bolt C is protrnded the action of spring F f'orcesthe pin f into the socket c, and if an attempt should be lmade to throw the bolt with afalse key .the pin f, bearing against Ithe lock-case, would electually prevent such an operation'. Neither could thelock be picked by passing a nail or instrument of any kind through the key-hole so as to force back the spring and dislodge the pin f from the bolt, as the moment the nail was withdrawn said pin would be instantly driven into the socket c by the :action of the spring. Y

The spring F cannot be forced back a sn'cient distance to withdraw the pin from thecase of the4 lock, as the hook E is adjusted in such a manner as only to allow a suicient movement of the pin f to clear the bolt. p

To throw thc bolt it is necessary to employ a key similar to that shown in fig. 3, and when such a key is inserted in the hole B the extension 'i forces back the spring so as to withdraw the pin f from socket c, as shown in iig. 2.

After the pin has thus been withdrawn by the insertion of the key, the latter is rotated in the usual manner', and the bolt C-retracted.

The extension i should be of such a length as to dislodge the pin f from the socket c, and at the same time not to withdraw said pin from the apertureo of the llock-case.

'The lock may be operated from the inside by simply turning the hook H down and the spring F up, as indicated by dotted lines in g. 1, which act leaves the key-holc unobstructed.

Claim.

hand. l

` GEORGE O. BOVEY.

IVitnesses: 1

GEO. H. KNIGHT, JAMES H..LAYMAN. 

